Roof fall occurred at 59 xcut #1 entry of the 22 East Longwall section. The fall is approx. 15 ft long, by 15 ft high, by 32 ft wide. The fall affected the escapeway of the longwall on the headgate side. 5 people were affected on the face, they exited out the tailgate entry. Cause of the fall was undetected. Area was bolted 8 ft bolts, rsin assisted, metal straps & screen.